I can`t get any sound from my pv8 mixer i put the speaker cable i have put the red & white phonos into the mixer from my laptop getting on sound from the clip at all please can you tell me where i am goinr wrong

See if another audio source connected to the mixer produces the same results. Try with the same cable and then with another cable. The purpose of this procedure is to determine if it is the cable and/or the laptop. (Sound card problem???) or mixer.
Is it ALL audio or just specific audio from for instance, a music application? Does it cut out using iTunes?
The mixer may have a bad or oxidized input. Try a different input channel? Are you using headphones to listen? It may be the headphone amp? OR, if audio is produced via amped speakers, it may be the mixer output. Does the mixer have metering? Do the meters also cut out? Does the laptop do the same thing if plugging in headphones to the laptop directly (no mixer)?

Connect the dvd audio outs, normally red and white phono jacks, to the inputs of your mixer. You may need phono to 1/4" phone jack adapters to do this, but they are available at Radio Shack, but hurry as they are going out of business.

What you've done should have worked on the video input. The phono will not sound like you'd want. Have you made sure the mixer is working correctly by trying it plugged into a different amp using the same outputs and cable?

your RCA from your mixers output has to go into the input of your amp. just switch that and you should be fine

Have you connected the Left speaker to the right speaker using the supplied cable? If not, connect the cable to the socket on the back of the right speaker labelled "to left speaker" and on the left speaker, to the socket labelled "from right speaker"
If this still doesn't solve the problem, try swapping the input cables (put the white plug in the red socket and vice versa) to see if this makes the left speaker produce sound, if it does, check the connection at the source to check the plug(s) are in all the way. If there is still no sound in the left speaker, unplug everything and do the following:
connect the left and right speakers with the supplied phono lead (Probably black) between sockets labelled "to left speaker" and "from right speaker"
then connect the source to any of the inputs on the back of the right speaker (ensure if using the red and white phono inputs that both are connected)
finally plug in power source.
Hope this helps

Yep! Get a decent audio interface that attaches to the PC with a USB connection and uses BALANCED lines to your mixer. I use a UA-25EX Roland/cakewalk as an example. (about $200 and there are cheaper units such as M-Audio Fast Track MKII ) Note these interfaces BOTH record and playback with two channels for stereo.
Essentially the audio board that is in PC's and Laptops are too near the switching noise of the processor and some of that is just bound to get into the audio lines as they don't even have balanced audio lines from the computers. Make sure you use either TRS or XLR balanced cables from whatever interface you get. Also connect ALL interconnected equipment to the same power source or receptacle. You can try to reduce the buzz with the mixer EQ's with what you have, but that sacrifices audio quality.

If ALL the lights are lit at once, including the clip lights, it is likely there is a failure in the power supply.

Use the stereo master outs from the DJM into the A and B Inputs of the EQ (you'll need 2 phono to Jack or 2 phono to XLR cables) then from the A and B Outputs of the EQ to the power amp/ speakers, etc (you'll need jack or XLR cables depending on what is powereing your speakers)

The final out put amp stage is out. MOSFET transistors likely. Hope this is helpful.

could be a few things , what have you tried to trouble shoot the problem ?
My steps would be ;
check all leads (even if you KNOW u pluged them in)
check the gain is set corectly .
check the line phono slectors are set to what ever you have you leads pluged into on the back of the mixer ( there is 4 red and white RCA plugs , 2 for phono,2 for line CDJs shold be using line )
if you are using digital cables to conect your CDJs , on the back on the mixer there is a small switch marked "CD or digital" make sure that is sleceted "digital " . if ur not using digital cables make sure it is on "CD" .
the info iv put here is based on the DJM-800 so your mixer my not have some of these featers as iv never used a 400 . hope this helps dued . check out www.djtutor.com for more tricks and tips . Pratices'N'enjoy !